No, this is the best Ratatta set(And everyone will now hate me for it)
Nature: Any
Item: Focus Sash
EVs: Any
Ability: Any
Moves: Quick Attack
(I can't remember if it's Endeavour or Reversal)
Any others I guess...
Level(REALLY IMPORTANT): 1
Just use the second move(I don't know which it is... I think it may be Endeavour) first, the other Pokemon will go first, and attack, but the Sash will kick in and block it. The move will then knock the opposing Pokemon to 1 HP. Next turn, use Quick Attack, and unless the opposing Pokemon also uses Quick attack, it'll faint the Pokemon before the opponent can faint you.
DT: AAAARGH MY NEMESIS. ... Yet I still plan on using it. Funny how that keeps happening to stuff xD
actually i think mine is better, rattata has enough speed to dominate nfe, (though it may be a tier >.>) and quick attack has minimal power.